公开(公告)号：JPH07162859A

公开(公告)日：1995-06-23

申请号：JP34077993

申请日：1993-12-08

Applicant: MATSUSHITA ELECTRIC IND CO LTD

Inventor： SUMINO SHINYA ,  TAKEUCHI SEIICHI

IPC: H04N19/60 ,  H04N1/41 ,  H04N19/129 ,  H04N19/134 ,  H04N19/149 ,  H04N19/176 ,  H04N19/186 ,  H04N19/196 ,  H04N19/423 ,  H04N19/625 ,  H04N19/63 ,  H04N19/85 ,  H04N19/91 ,  H04N7/30

Abstract: PURPOSE:To heighten encoding efficiency in image encoding and image decoding. CONSTITUTION:Frequency conversion and blocking are applied to an input image signal 1 by a spatial/frequency converter 2, and it is quantized. The re-arrangement of a quantization value 5 with different orders is performed by scan converters 6a-6c. Re-arranged quantization values 7a-7c are inputted to encoding quarvtity calculators 8a-8c, respectively, and encoding quantity 9a-9c when variable length encoding is performed are calculated. A comparator 10 compares the encoding quantity 9a-9c, and outputs the scan converter in which the encoding quantity can be minimized as a selection value 11. The selection value 11 is accumulated in memory 12 transiently. While, a selector 14 reads out the selection value 11 calculated by an adjacent encoded block from the memory 12, and selects the quantization value of the scan converter shown in the value, and outputs it as a quantization value 15. The quantization value 15 is sent out by variable-length encoding by an encoder 16.

公开(公告)号：JPH07162856A

公开(公告)日：1995-06-23

申请号：JP24784194

申请日：1994-10-13

Applicant: DAEWOO ELECTRONICS CO LTD

Inventor： HAYASHI SHIYOUTAI

IPC: H04N19/176 ,  H04N7/24 ,  H04N19/129 ,  H04N19/132 ,  H04N19/146 ,  H04N19/196 ,  H04N19/503 ,  H04N19/51 ,  H04N19/60 ,  H04N19/61 ,  H04N19/91 ,  H04N19/93 ,  H04N7/30

Abstract: PURPOSE: To improve the efficiency of encoding by adaptively scanning a quantized transformation coefficient(TC) block by using many scanning matrixes. CONSTITUTION: An input digital video signal is inputted to a quantized TC generator 110. The generator 110 transmits a generated quantized TC block to statistic encoders 120, 130, 140. The encoders 120, 130, 140 simultaneously operate the simultaneously inputted TC blocks, execute variable length encoding for scanned TCs and respectively transmit variable length encoded data to a data selector 760. The encoders 120, 130, 140 calculate the bit length of respective variable length encoded data and respectively transmit bit length values to a comparator 150. The comparator 150 sends a selection signal to the selector 160, which sends selected variable length encoded data to a transmission buffer 170. The buffer 170 sends the inputted data to a transmission channel.

公开(公告)号：JPH07115533A

公开(公告)日：1995-05-02

申请号：JP26116293

申请日：1993-10-19

Applicant: TOSHIBA CORP

Inventor： YAMAZAKI MITSUO

IPC: G06K9/32 ,  G06T3/60 ,  G06T7/60 ,  G06T9/00 ,  H04N1/387 ,  H04N1/41 ,  H04N19/129 ,  H04N19/136 ,  H04N19/14 ,  H04N19/42 ,  H04N19/423 ,  H04N19/60 ,  H04N19/625 ,  H04N19/80 ,  H04N19/85 ,  H04N19/91 ,  H04N7/30

Abstract: PURPOSE:To realize the simplification of the configuration by simplifying processing to discriminate a tilt of a character string in image data. CONSTITUTION:The compressor is provided with a low pass filter 14 smoothing image data by leaking and interleaving a low frequency component in each of horizontal and vertical directions in the image data, a DCT section 15 applying discrete cosine transformation(DCT) to output block data of the low pass filter 14 and a discrimination section 16 discriminating a tilt of a character string in the image data from an output of the DCT section 15. The discrimination section 16 discriminates it to be a tilt in the character string when a value appears at a column other than a 1st column of a DCT output and sets a method of reading the image data from a frame memory 13 optimum to eliminate the tilt in the character string based on the result of discrimination to a memory controller 12.

公开(公告)号：JPH06284406A

公开(公告)日：1994-10-07

申请号：JP9228593

申请日：1993-03-26

Applicant: VICTOR COMPANY OF JAPAN

Inventor： NAKAMURA HIROYA ,  SUGIYAMA KENJI

IPC: H03M7/30 ,  G06T9/00 ,  H04N19/12 ,  H04N19/126 ,  H04N19/129 ,  H04N19/134 ,  H04N19/136 ,  H04N19/14 ,  H04N19/174 ,  H04N19/176 ,  H04N19/186 ,  H04N19/196 ,  H04N19/46 ,  H04N19/463 ,  H04N19/503 ,  H04N19/59 ,  H04N19/60 ,  H04N19/61 ,  H04N19/625 ,  H04N19/70 ,  H04N19/85 ,  H04N19/93 ,  H04N7/133 ,  G06F15/66

Abstract: PURPOSE:To obtain the orthogonal transformation coder with a high coding efficiency in which a noise component is hardly noticeable. CONSTITUTION:Activity detectors 8, 9 obtain activity for each (picture element) block based on a transformation coefficient from orthogonal transformation means (horizontal DCT 2 and vertical DCT 3) whose dimension differs. A mode discriminator 10 compares detected activities to discriminate the orthogonal transformation method for a coding object. Based on the result of discrimination, a selector 4 is used to select the transformation coefficient to select orthogonal transformation with an optimum dimension to each block and a quantization device 5 and a variable coder 6 execute the coding.

公开(公告)号：JPH06284403A

公开(公告)日：1994-10-07

申请号：JP6948393

申请日：1993-03-29

Applicant: TOSHIBA CORP

Inventor： KIMURA JIYUNKO

IPC: H03M7/30 ,  G06T9/00 ,  H04N1/41 ,  H04N1/417 ,  H04N19/129 ,  H04N19/136 ,  H04N19/33 ,  H04N19/36 ,  H04N19/503 ,  H04N19/60 ,  H04N19/61 ,  H04N19/625 ,  H04N19/65 ,  H04N19/91 ,  H04N7/133

Abstract: PURPOSE:To enhance the coding efficiency by controlling a DC component of upper layer data of a conversion coefficient coded in a hierarchical structure together with an AC component so as to be coded through scanning conversion simultaneously. CONSTITUTION:Digital video signals subjected to blocking are fed to an orthogonal transformation circuit 11 DCT 11, in which the signal is transformed into a transformation coefficient and the coefficient is divided and sequentially subject to hierarchical layer coding. Then lower layer data are fed to a variable length coding circuit 13 via a quantization circuit 12, upper layer data are inputted to a subtractor circuit 16 via a quantization circuit 15, in which the upper layer data are subtracted from the lower layer data by each frequency component and the result is fed to a variable length coding circuit 17. The DC component in the output of the circuit 12 is fed to a DPCM circuit 32 of the coding circuit 13 together with a DC component of a block coded precedingly and a difference error signal is coded by a variable length coding circuit 34 and fed to a multiplexer 35. Furthermore, the AC component is subjected to scanning conversion at a zigzag scan circuit 36 and the result is fed to the circuit 35. Thus, the AC component and the DC component are all outputted.

公开(公告)号：JPH06245077A

公开(公告)日：1994-09-02

申请号：JP2833793

申请日：1993-02-18

Applicant: NEC CORP

Inventor： KATTO JIRO

IPC: H03M7/30 ,  G06T9/00 ,  H03M7/36 ,  H03M7/40 ,  H04N1/41 ,  H04N19/126 ,  H04N19/129 ,  H04N19/136 ,  H04N19/14 ,  H04N19/152 ,  H04N19/196 ,  H04N19/423 ,  H04N19/46 ,  H04N19/463 ,  H04N19/503 ,  H04N19/51 ,  H04N19/517 ,  H04N19/59 ,  H04N19/60 ,  H04N19/61 ,  H04N19/635 ,  H04N19/70 ,  H04N19/80 ,  H04N19/91 ,  G06F15/66 ,  H04N7/133

Abstract: PURPOSE:To improve the encoding efficiency of the wavelet conversion encoding of picture signals. CONSTITUTION:A pre-processing circuit 1 realizes signal processings such as movement compensation adaptive prediction and prefiltering, etc., for input pictures, a two-dimensional wavelet conversion circuit 2 realize the wavelet conversion for the output of the pre-processing circuit 1 and a quantization circuit 3 quantizes the output of the two-dimensional conversion circuit 2. A scanning circuit 4 scans a two-dimensional wavelet conversion coefficient which is quantized output corresponding to a scanning pattern set beforehand and obtains one-dimensional signal, series. A VLC circuit 5 executes variable length encoding to the one-dimensional signal series, the VLC circuit 6 executes the variable length encoding to auxiliary information such as a motion vector and a quantization step size, etc., and a multiplex circuit 7 multiplexes variable length codes to be encoder output.

公开(公告)号：JPH06141297A

公开(公告)日：1994-05-20

申请号：JP31082092

申请日：1992-10-27

Applicant: TAKAYAMA KK ,  SHARP KK

Inventor： UIWATSUTO UONWARAUIPATSUTO ,  YOU IKOU ,  KOTOBUKI KOKURIYOU ,  TAKATORI SUNAO ,  YAMAMOTO MAKOTO

IPC: H04M11/06 ,  H04N7/14 ,  H04N19/00 ,  H04N19/102 ,  H04N19/119 ,  H04N19/129 ,  H04N19/132 ,  H04N19/136 ,  H04N19/137 ,  H04N19/176 ,  H04N19/189 ,  H04N19/196 ,  H04N19/51 ,  H04N19/59 ,  H04N19/85 ,  H04N19/90 ,  H04N7/13

Abstract: PURPOSE:To transfer an animation efficiently with a simple configuration by dividing the picture into plural blocks and transferring the picture in an optimum mode in response to a rate of a change obtained based on a difference between blocks corresponding to between consecutive pictures. CONSTITUTION:A transfer picture is divided into a prescribed number of blocks, number of blocks of a fetched picture I(t) in which a difference between relevant blocks of both the picture I(t) and a picture I(t-1) at a preceding time is a prescribed value or over is obtained, the number is divided into three stages with the number of block as a rate of change, and the picture is transferred in a prescribed mode by an I encoder according to the stage discriminated by the M discrimination. Furthermore, for the blocks whose difference is a prescribed value or below, whether it is an animation stop blocks or still picture blocks are discriminated by the E discrimination, and the picture is processed and transferred respectively accordingly. Thus, the animation is efficiently transferred.

公开(公告)号：JPH05284421A

公开(公告)日：1993-10-29

申请号：JP8207392

申请日：1992-04-03

IPC: H04N5/253 ,  H04N19/102 ,  H04N19/107 ,  H04N19/129 ,  H04N19/132 ,  H04N19/136 ,  H04N19/137 ,  H04N19/157 ,  H04N19/172 ,  H04N19/196 ,  H04N19/423 ,  H04N19/46 ,  H04N19/503 ,  H04N19/51 ,  H04N19/60 ,  H04N19/61 ,  H04N19/625 ,  H04N19/70 ,  H04N19/85 ,  H04N19/91 ,  H04N7/133

Abstract: PURPOSE:To eliminate large periodic fluctuation in picture quality of a video image by allowing most parts of encode and decode sections to implement signal processing with a system clock corresponding to a frame frequency of 24Hz when a film video is encoded. CONSTITUTION:When a signal inputted to input terminals 1000, 1002 is a film video converted into a television signal at an encoder side, the periodic arrival of the same video is detected by film video detection circuits 1003, 1006, a frame or field frequency of an input video signal is converted into a substantial frame frequency of the film video by frame frequency conversion circuits 1002, 1005 to eliminate a redundant frame and then the picture is compressed and the compressed picture is sent. When the video signal processed in this way is received at a decoder side, the inverse elapsed picture to that at the encoder side is implemented to convert the signal into a television signal.

公开(公告)号：JPH05260456A

公开(公告)日：1993-10-08

申请号：JP7531091

申请日：1991-04-08

IPC: H03M7/30 ,  G06T9/00 ,  H04N1/41 ,  H04N1/415 ,  H04N19/102 ,  H04N19/107 ,  H04N19/126 ,  H04N19/129 ,  H04N19/134 ,  H04N19/136 ,  H04N19/14 ,  H04N19/149 ,  H04N19/15 ,  H04N19/174 ,  H04N19/196 ,  H04N19/423 ,  H04N19/46 ,  H04N19/503 ,  H04N19/60 ,  H04N19/61 ,  H04N19/625 ,  H04N19/70 ,  H04N19/85 ,  H04N19/91 ,  H04N7/133 ,  G06F15/66

Abstract: PURPOSE:To improve the coding efficiency by revising the sequence of coded areas based on importance and a quantization scale. CONSTITUTION:A slice coding order decision device 18 divides an input picture into some areas, the importance is sequenced to each area, the coding sequence of the areas whose importance is placed depending on whether a quantization scale decided by a buffer occupancy quantity after coding of each area from a buffer (I) 22 and used for succeeding coding is larger than a set threshold level and coding is applied to slice data in a frame memory (FM) 20 in this order by using a discrete cosine transformation device (DCT) 24, a quantizer (Q) 26 and a variable length coder (VLC) 28 or the like.

公开(公告)号：JPH04301987A

公开(公告)日：1992-10-26

申请号：JP6467591

申请日：1991-03-28

Applicant: SONY CORP

Inventor： OOSAKI KEITAROU ,  KURIHARA AKIRA

IPC: H04N3/27 ,  H04N7/01 ,  H04N11/20 ,  H04N19/00 ,  H04N19/126 ,  H04N19/129 ,  H04N19/132 ,  H04N19/15 ,  H04N19/196 ,  H04N19/42 ,  H04N19/423 ,  H04N19/587 ,  H04N19/59 ,  H04N19/625 ,  H04N19/85

Abstract: PURPOSE:To simplify configuration by omitting an exclusive circuit for detecting operations in line transformation between a television standard system and a CIF system. CONSTITUTION:An encoding control part 23 in a video encoder 20 of the CIF system detects the amount of residual data in a transmission buffer part 24, when this residual data amount is larger than a prescribed value, an input image is regarded as a moving image and an in-field line transformation circuit 11 is operated. When the residual data amount is smaller than the prescribed value, the input image is regarded as a still picture and the operation is switched to an in-frame line transformation circuit 12.